Despite receiving the chassis and componentry from the F01 long wheel base BMW 7-Series, the RR4 is said to feature it's own exclusive engine. However, it is believed the engine will just be a variant of existing BMW engines such as a slightly higher displacement version of BMW's 407hp twin-turbo 4.4-liter V8 already seen in the X6 or an uprated version of BMW's 6.0-litre V12 in the current 760i.

The diminutive ultra-luxury Roller is scheduled for a 2010 launch. We expect RR4 prototypes to gradually shed their camouflage over the course of 2009.